Measure and optimize your social media marketing. Actionable analytics, social media optimization. Crowdbooster measures how well you are performing on Twitter and gives you insights that make you more effective.

So, if my account name is @crowdbooster, its 12 chars long + @ + space, which is 14. If somebody will RT my tweet, there will be an "RT <name> <original tweet>", which is 4 plus additional character (RT, space, another space after the name). So if I want to be retweeted my tweets without shortening, I have to write 122 characters long, not 140. (140-14-4, ofc)

I always forget this, and I write longer then this.

So, if there would be a counter next to the maximum of 140 character counter, it would be useful to me to keep my tweets in a "retweeted without shortening" format.

contains the remaining characters till the maximum RT-ready character count, unless the remaining characters,
For example: crowdbooster will have a counter till 124 (the "RT @Crowdbooster" is 16 character long).